Telephony.



ym. L. JOHNSON. TELEPHONY.

APPLICATION FILED .|UME'29. 19H.

4 SHIRTS-SHEET l.

A KT-1*;

. E c n A ,F73 GL. d "ffa ,ff/'Y j`H F I G I l naa F164 F1015 WITNssEs v. I JNI/ENTQR MoR TON L. QHNsaN Patented Allg. 14, 1917.

TELEPHUNYI APPucATmN man JUNE 29. 1s 1 4.

4 SHEETSfSHEET 3.

WITNESSES IN1/wml? B MQRTON L. JOHNSON ATTaRA/EY M. L. JOHNSON.- y

TELEPHONY. APPLICATION FltED )UNE 29. 1914.

Patented 14, 1917.

" 4 SHEETS-SHEET 4.

.l F] u l INJ/ENToR- ifTON LcOHNSo/v WJTNL'SSES flvofivwnr UNITED STATES PATENT oEEIoE.

Horror: L. JonNsoN, or cHIcAeo, ILLINoIs, AssIeNon To FRANK s. econ comprimi, or cHIcAeo, ILLINoIs, A conPonATIoN or ILLINoIs.

TELEPHONY.

Specication of Letters Patent.

Patented Aug. 14. 1917.

Application mcd J'une 29, 1914. Serial lic. 847,824.

the following is a full, clear, concise, and

exact description, reference being had to the accomparlifing drawings, Iforming a part of this spec'` cation.

My invention relates to telephone eX- change systems wherein .link connectorsV are provided each having operator controlled means at one'end for connection with calling lines and preferably at the other end for connection with called lines. My invention preferably includes means whereby subscribers may select such link connectors for use, and preferably provides' for the selection of an idle link selector which is preferably controlled by the calling subscriber.`

I will explain my inventionmore fully by reference to `the accompanying drawings showing the preferred embodiment thereof and in which Figure 1 is a diagrammatic view illustrating theinvention as simply as possible; Fi 9 is a view illustrating the manner in w ich Figs. 3, 4 and 5- are to be assembled in order that they may be read in connection with each other; and Figs. 3, 4 and 5, when assembled as indicated in Fig. 2, indicating, in diagrammatic detail, one form ofltelephone exchange system equipped in accordance with the invention.

Y Referring first more particularly to Fig. 1, I have there diagrammatically indicated two substations, 90, 9 5, which extend to the exchange where'they are provided with selector switches-A. Similarlypositioned waiting. contacts of these selector switches are multipled and the different groups of these multipled waiting contacts are individual each toV different operators positions generally `indicated at B where the operatorsl are provided with telephone outts C., Each group of waitingcontacts is also individual to a selector switch D, similarly positioned waiting contacts'of these selector switches D being multipled and the different groups of these latter multipled waiting contacts are individual each to a. different link connector Each of these link connectors 'E terminates at'both ends in operator controlled l terminals which are here shown in the form of wipers constituting arts of connector switches F, F1, though t e invention is not to be limited to the nature of the terminals provided for the link connectors E. When connector switches F, F1 are provided each waiting contact of each is individual to a telephone line of a group, all `the telephone lines of such group having waiting contacts 'i in each switch F. The system illustrated isof a hundred line capacity, it being understood that ifv a larger system is employed that selector switches would intervene between the switches D and F. Then the con-- nector switches F, F1 are em loyed the operator is equipped with keys I, H for eiecting the operation of ,such connector switches, these keys G, H being connected with the selector" switches D when the associate operators telephones are connected with the calling lines-that have become connected with such switches D. In establishing connection the calling subscriber will remove his telephone from its switch hook, thereby setting the wipers of his selector switch- A. into operation until such wipers encounter the wait ing contacts pertaining to an idle operator B, whereupon the wipers `will stop 1n connection with the telephonclof the selected operator and the selector switch D individual tothe selected' operator whereupon the selector switch D that has become connected with the calling line will have its wipers set into operation untilthey become connected with the waiting contacts pertaining to an idle link connector E after which 'the selected operator' will manipulate her switching apparatus G H to bring the connector switches F,-F1 of the selected link connector E into connection withthe calling ,and called lines to establish connection therebetween.

Referring now more particularly to Figs. 3,' 4 and 5, at each of the substations 90 and 95 I have illustrated well known` telephone equipment that includes a telephone transmitter 1, telephone receiver 2, a call bell 3, a condenser 4, and a telephone switch hook 5, the telephone switch hooks serving, when` supporting the receivers, to open the telephone bridges at the substations. The bell and condenser at eachv substation is shown as being included in permanent bridge of' the associate telephone line. When a call is initiated the'calling subscriber will metallically connect the sides Gand 7 of his line v by the establishment of his telephone bridge whereby a circuit is established which may be traced from the grounded battery 8 (which may be common to the exchange) the upper winding of the line relay 9 yoi the cal ing line, the intermediate armature switch of the cutoff relay 10 and its contact,`

the line side 6 of the calling line, the telephone bridge at the calling station, the line i side 7 of the calling line, the bottom armature switch of the cutoff relay 10- an'd its contact, to the lower grounded winding of said line relay 9. The line relay is thereupon energized to establisha circuit traceable from its lower grounded armature switch, the contact of this switch, they bottom armature switch of the 11 and its contact, the winding of motor magnet 12, the interrupter 13, to the grounded battery 8. By reason of the interrupter 13 the' circuit of ma et 12 is intermittently established where y its armature switching relay occasions the step by step movement of the ratchet wheel 14 upon the shaft 15, on which shaft the'wipers 16, 17 and 18 of the 'selector switch A belonging to the calling line are mounted. The wipers ofthe operatingswitch A are turned until the wiper 18 engages lan ungrounded waiting contact that pertains to an idle operator and an idle switch D. As the wiper 18 passes,l over grounded contacts circult is` established and maintained which is traceable from the grounded contact connectedwith the wiper "18, through the wiper, theuppermost `armarelay 19, the armature of magnet 12 and the Contact engaged thereby, to ground. When the wiper 18 'engages an ungrounded waitg. contact the circuit previously traced through. the upper winding of relay 19 is no longer maintained whereby the relay 19 is denergizedwhen the armature of the driv- -ing magnet is restored Ato normal whereby f the armature switches of relay 19 are re- .'leaSed. The lowermost armature switch of relay-'19, when released, engages its grounded contact to establish a circuit traceable ,from this'contact and its armature switch, through the lower armature switch of relay 20 and its engaged contact (relay 20 having .previously been energized by va circuit traceablejfromthev lower grounded armature switch Ofrelay v9 and its contact, the wind- Y ing 'of relay 20, the intermediate amature 'locking circuit estab switch of relay 19 and its .engaged contact,`

to the grounded battery 8, the circuit for this magnet 20Y bein maintained by the magnet 12 to stop ,telephone at the se ed u by the 1 traceable from the grounded battery 8, the upper armature switch of relay 20 and its engaged contact, the windingjof relay 20, the lower armature switch of relay 9 and its engaged Contact, to ground), the windin of relay 11, to the grounded battery 8. he relay 11 being thus energized, its lower armature switch opens the circuit of the motor the rotation of the wipers 16, 17 and 18 and its two upper armature switches engage 'their contacts to connect the two wipers 16, 17 respectively with the sides 6 and 7 an idle operator at a non-busy position C and having telephone equipment B. This telephone equipment is included in circuit with the calling line owing to the energization ofthe switching relay 21, there being one such relay 21for each operators position, this relay at a selected operators position being energized for the urpose of including the ected operators position in circuit, the energizing circuit of the relay being traceable from the grounded battery 8, the operator controlled lrelease key 22 (for restoring the selected operators telephone equipment to its normal openl circuit condition) the winding of relay 21, the wiper18' and the waiting contact engaged thereby, the lower-most armature switch of relay. 11 and its alternate contact, the lower armature switch of relay-9 and its engaged contact, to ground. The selected operators telephone set is now in circuit with-the calling line and the selected operator ascertains the number of the line wanted. Vhen an operators outiit is selected vthe selector switch D individual to such operator is also` selected and is set into motion to select an idle link E. This result is due to the circuit established at the lower-most armature switch of relay 2]., which circuit is traceable from the grounded contact of this armature 'switch. the Amnture switch, the winding of relay 23, to the grounded battery 8, the left hand and. rounded armature switch of relay 23 esta lishing a circuit traceable from of the calling line. The callv ,ing line is now connected with this armature switch,v through the contact thereof, the winding of sluggishly operating interrupter relay 24 the armature switch ofv this relay land its engaged contact, the winding of motor magnet 25, the side switch wiper 26 of the selected switch D in the first position of this side switch wiper, to the grounded battery` 8. Due to the energize,-v

tion of the motor magnet 25, wipers 27, 28, 29, 30, 31 and 32 contlnue inv operation until wiper 29 engages an ungrounded waiting contact whereupon circuit for ther private wipers 26, 3 4 'and35 to step into their sec- 'magnet 33 is openedtocause the side switchv ond positions, the circuit for the motor l magnet 25 being conse uently opened at the Side switch wiper 2 6. he Side switch wiper rn the private magnet will move the side switch The busy tone producing equipment includes A the interrupter 56, the induction device 57,`

vswitch F1 is of the usual kin the ringing generator 52, the ringing relay wipers 51 and 42 to their third* position, thereby establishing the circuit for the` operation of cut-oIrela-y 10, the operating circuit of which already has been described.

' The side switch wiper 5l in its third position provides a circuit for the operation of the switching relay 48. The operation of this relay extends the talking circuit of the connector through to the switch wipers 39 and 40 and disconnects the line relay 47. The circuit may be traced as fol ows:

Grounded battery, switch wiper 51, winding` of relay 48 to upper armature switch of relay 431 associated with connector switch F1, thence to the ounded contact, relay 431 at this time belng energized through a circuit similar to that already described for relay 43 of switch F. The ground established through the upper armature switch and contact of relay 431 also serves to maintain the circuit for the operation of cut-off rela 10 after relays 47 and 43 of switch F have denergized.

The operator will next manipulate the key or switch H to operate the connector F1 to connect the called line with the selected link connector thereby to complete the connection between the calling and called lines. The operations previously described in connection with switch F follow in connection with the operation of the switch F1, it being unnecessary to repeat this description, it being, however, stated that parts of switch F1 that are similarl to correspondingly operating parts of switch F are given 'characters of reference similar to those applied to such corresponding parts of switch F withprime exponents added. The connector F1, since it pertains to the calledv line, is provided with the additional equipment that connector switches usually have and which enable the impression of signaling current upon called lines and the manifestation of a busy test if the desired line is busy. The ringing and testing equipment sipplied by the and includes 53, the ringing interrupter 54, and the armature switches 55 of the ringing relay 53.

etc. The connector switch 'F1 also has the talking side switch wipers 58 and 59, the private cutoff relay 60, and the back bridge rela 6l. There are added to the described equlpment of switches F, F1 relays 62 and 621 having similar functions and which are controlled by the relay 63 common thereto, this relay in turn being controlled by the key 22. The relay 63, havlng had its clrcuit'established through the side switch wiper 35, of switch Din second position and the associate wiper 30 then engaging the waiting normal switch 65 of switch D havin beenv Y re closed. The switch D is consequen stored to normal whereby the circuit of relay 63 is opened at the side switch wiper 35 and the wiper -30 of switch D, which wipersiare now restored to normal. The armature switch of the now denergized relay 63 establishes a circuit traceable from the grounded battery 8, through the armature switch of relay 63 the winding of relay 621 the winding of relay 62, the upper armature switch of t e sluggishly operating relay 431 to ground. The windings of relay 471 are now placed in brid e of the calli line by a previous path. en the calle party answers the windings of relay 61 are' previously attracted upper armature switch upon the relay 48 is removed fromv such relay to denergize it whereupon the lowermost armature switch of relay 48 ,closes circuit through the release magnet 49 to restore the connector switch F to normal.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to, the precise details of construction and circuit arrangement shown as chan es may readily be made without departing rom the spirit of my invention, but having thus describedmy invention I claim as new and desire to secure by Letters Patent the following l. telephone exchange system including telephone lines; a plurality of link connectors each provided with an operator controlled electro-magnetic switch at each end to connect' the same with lines; and calling subscriber controlled selector mechanism for selecting free link connectors.

2. A telephone exchange system including telephone lines extending to an exchangev lio positions and each providedwith anv o erator controlled electro-magnetic switc at l each end to connect the same with lines; and

callingsubscriber controlled link connector selectors for selecting free link connectors.

n 3. A telephone exchange system including telephone lines extending to an exchange having a plurality of operators positions; link connectors common to the operators positions and each provided with an o erator controlled electro-magnetic swit at one end to connect the same with calling lines; and calling subscriber controlled link connector selectors for selecting free link connectors. y

y A telehlone exchange system including telephone es extending to an exchange where there are a plurality of operators positions; a plurality of link" connectors "sitions; a plurality of link connectors each Eorovided with operator controlled means at th ends to connect the lsame with lines; selector switches for selectin three y link connectors; and selector switc es governed including' by calling subscribers fof selecting idle op.

erators and lidle link selector switches.

6. A telephone exchange system including telephone lines extending tojanv exchange where there are a plurality'of operators positions; a plurality of link connectors provided with` operator contmlled means at one end to connect the same with calling lines; calling subscriber controlledgselector .switches for selecting free link connectors; Vand selector switches governed by callin subscribers for selecting idle operators an idle link selector switches.

7. A telephone exchange system including telephone lines extending to an exchange where there are a plurality of operators positions; a plurality of link connectors each provided with operator controlledv mea-ns at one end to connect the same with calling lines; selector switchesfor selecting free link connectors; and selector switches governed by calling subscribers for selecting idle operators and idle link selector switches.

In witness whereof, I hereunto subscribe mylname this thirteenth day of J une, A. D. 19

MORTON L. JOHNSCWL` Wit/n:

E'rrx L. WH G. L. Omoo. 

